Classical density-functional theory of inhomogeneous water including explicit molecular structure and nonlinear dielectric response

Details Classical density-functional theory of inhomogeneous water including explicit molecular structure and nonlinear dielectric response Classical density-functional theory of inhomogeneous water including explicit molecular structure and nonlinear dielectric response

2009-02-08

arxiv.org/abs/0902.1280v1

J. Phys. Chem. B, 2010, 114 (5), pp 1946-1953

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 6 figures

Scientific paper

10.1021/jp9012224

We present an accurate free-energy functional for liquid water written in terms of a set of effective potential fields in which fictitious noninteracting water molecules move. The functional contains an \emph{exact} expression of the entropy of noninteracting molecules and thus provides an ideal starting point for the inclusion of complex inter-molecular interactions which depend on the \emph{orientation} of the interacting molecules. We show how an excess free-energy functional can be constructed to reproduce the following properties of water: the dielectric response; the experimental site-site correlation functions; the surface tension; the bulk modulus of the liquid and the variation of this modulus with pressure; the density of the liquid and the vapor phase; and liquid-vapor coexistence. As a demonstration, we present results for the application of this theory to the behavior of liquid water in a parallel plate capacitor. In particular, we make predictions for the dielectric response of water in the nonlinear regime, finding excellent agreement with known data.

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